Medicament delivery device

1 . A medicament delivery device for dispensing discrete doses of medicament, the device comprising:

first and second medicament carriers each comprising said doses of medicament contained in a plurality of individual compartments spaced along a carrier strip and sealed by a sealing layer;

first and second opening mechanisms each arranged to handle a respective one of the first and second medicament carriers and to open each compartment of the respective medicament carrier by separating the sealing layer from the carrier strip as the medicament carrier is advanced through the device;

a take-up spool arranged to wind the separated sealing layers thereon to maintain the separated sealing layers in tension, each separated sealing layer having a path of travel between a respective one of the first and second opening mechanisms and the take-up spool; and

a tension control element in contact with each of the separated sealing layers,

wherein at least a part of the tension control element is arranged to be movable by a biasing force, which is exerted on the tension control element by the separated sealing layers as a result of any inequality in the tensions of the separated sealing layers wound by the take-up spool, to alter the relative lengths of the path of travel of the separated sealing layers so as to substantially equalize the tensions in the separated sealing layers.

2 . A device according to claim 1 , wherein at least a part of the tension control element is resilient.

3 . A device according to claim 1 , wherein the tension control element is slidably arranged such that the tension control element is movable in translation.

4 . A device according to claim 1 , wherein the tension control element is pivotably arranged such that the tension control element is movable in rotation.

5 . A device according to claim 4 , wherein the tension control element comprises first and second resilient arms each in said contact with a respective one of the separated sealing layers.

6 . A device according to claim 1 , wherein the tension control element is pivotably and slidably arranged such that the tension control element is movable in rotation and translation.

7 . A device according claim 1 , wherein the tension control element is arranged to be movable by the biasing force in a first direction toward a first one of the separated sealing layers and away from a second one of the separated sealing layers, so as to lengthen the path of travel of the first one of the separated sealing layers and shorten the path of travel of the second one of the separated sealing layers, thereby to substantially equalize the tensions in the separated sealing layers.

8 . A device according to claim 7 , wherein the tension control element is further arranged to be movable by the biasing force in a second, opposite direction toward the second one of the separated sealing layers and away from the first one of the separated sealing layers, so as to lengthen the path of travel of the second one of the separated sealing layers and shorten the path of travel of the first one of the separated sealing layers, thereby to substantially equalize the tensions in the separated sealing layers.

9 . A device according to claim 1 , wherein an entirety of the tension control element is arranged to be movable by the biasing force.

10 . A device according to claim 1 , wherein only a part of the tension control element is arranged to be movable by the biasing force.

11 . A device according to claim 1 , wherein the tension control element comprises plastics.

12 . A device according to claim 1 , wherein the tension control element comprises a metal or a metal alloy.

13 . A device according to claim 1 , wherein the take-up spool comprises a friction clutch configured to allow limited slip when a predetermined tension is exceeded in at least one of the separated sealing layers.

14 . A device according to claim 1 , wherein the device is a dry powder inhaler device arranged to deliver medicament from said first and second medicament carriers each containing a plurality of doses of dry powder medicament.

15 . A medicament delivery device for dispensing discrete doses of medicament, the device comprising:

first and second medicament carriers each comprising said doses of medicament contained in a plurality of individual compartments spaced along a carrier strip and sealed by a sealing layer;

first and second opening mechanisms each arranged to handle a respective one of the first and second medicament carriers and to open each compartment of the respective medicament carrier by separating the sealing layer from the carrier strip as the medicament carrier is advanced through the device;

a take-up spool arranged to wind the separated sealing layers thereon to maintain the separated sealing layers in tension, each separated sealing layer having a path of travel between a respective one of the first and second opening mechanisms and the take-up spool; and

a tension control element in contact with each of the separated sealing layers, the tension control element being disposed at a spaced distance from the take-up spool,

wherein at least a part of the tension control element is arranged to be movable by a biasing force, which is exerted on the tension control element by the separated sealing layers as a result of an inequality in the tensions of the separated sealing layers wound by the take-up spool, to alter a length of the path of travel of each separated sealing layer so as to substantially equalize the tensions in the separated sealing layers.